BUG: fixedPressure: map value as well as gradient

src/finiteVolume/fields/fvPatchFields/derived/fixedFluxPressure/fixedFluxPressureFvPatchScalarField.C

@@ -53,8 +53,12 @@ Foam::fixedFluxPressureFvPatchScalarField::fixedFluxPressureFvPatchScalarField
     fixedGradientFvPatchScalarField(p, iF),
     curTimeIndex_(-1)
 {
+    // Map value. Set unmapped values and overwrite with mapped ptf
+    fvPatchField<scalar>::operator=(patchInternalField());
+    map(ptf, mapper);
+    // Map gradient. Set unmapped values and overwrite with mapped ptf
     gradient() = 0.0;
-    map(gradient(), mapper);
+    gradient().map(ptf.gradient(), mapper);
 }